Design for the Seventh Generation

Volume IV — Production and Regeneration

Nine movements, seven generations.

THE PLATE

A watercolour of hills ploughed into bands of ochre and green, a farm on the far ridge. — Plate IV.09The Nursery Rows.Nobody plants a two-hundred-year tree for the tree. They plant it for the spacing, the succession, the road that reaches it and the ledger that will still be paying somebody to weed it in eighty years. The seedling is the cheapest part.

THE LETTER

Somewhere in your organisation there is a decision that will outlive everyone who will ever discuss it, and it is being made this quarter by people who will never be asked about it again.

A pipe specification. A concrete mix. A roof warranty. A species choice in a planting scheme. A structural grid that decides for a century what the building can ever become. These are quiet decisions, taken at a level of seniority that guarantees no board will see them, and each one silently sets a date: the year somebody else will have to do it all again.

This chapter is about designing on purpose at that length, and — the part that is usually missing — how to get it financed by people who are not being paid to care about it. Those are two different problems and they are usually run together, which is why the argument for long-lived things is so often made in the language of virtue. It does not need to be. It has arithmetic.

The arithmetic has three parts and you can have them now. A structure designed for two hundred years costs less in cash than one designed for forty, by a factor near two and a half. At a conventional corporate hurdle rate it loses anyway, and the reason is not the one people assume. And there is a class of instruments — endowments, perpetual trusts, sinking funds, indexed maintenance covenants — under which the arithmetic stops depending on the hurdle rate at all, because they convert a promise about the future into a sum of money today.

One thing before we begin, and it matters more than any figure here. The phrase seventh generation belongs to a living government, the Haudenosaunee Confederacy, and it is routinely quoted in commercial literature in a form that does not appear in any recorded text of the Great Law. This chapter says what is documented and what is later attribution, in the first movement, before it uses the idea at all. Getting that wrong in a textbook is not a small error. It is the kind that cannot be taken back.

— The Editors

DISCOVERY

What is already working

Start with the attribution, because the attribution is part of what works.

The Haudenosaunee Confederacy — Mohawk, Oneida, Onondaga, Cayuga, Seneca, and from about 1722 the Tuscarora — is governed by the Great Law of Peace, Kaianere'kó:wa, transmitted orally and recorded in wampum. Its founding is dated differently by different authorities: some Haudenosaunee accounts and the argument of Mann and Fields (1997) from a recorded solar eclipse place it around 1142; other scholarship places it in the fifteenth or sixteenth century. The dispute is real and honest people hold both positions.

The most widely reproduced English rendering is Arthur C. Parker's The Constitution of the Five Nations (1916), published as New York State Museum Bulletin 184, which sets out the Newhouse and Chiefs' versions. In Parker's text, the duties laid on the Confederate Lords include this:

Look and listen for the welfare of the whole people and have always in view not only the present but also the coming generations, even those whose faces are yet beneath the surface of the ground — the unborn of the future Nation.

Read it carefully. It is a clause about unborn generations and it does not say seven. The number is not in the recorded text.

The seven-generation formulation is nonetheless genuinely Haudenosaunee, and it is a living teaching rather than an archaeological one. Its most influential public articulation is by Oren Lyons, Faithkeeper of the Turtle Clan of the Onondaga Nation, who carried it into international forums from the 1970s onward — including the 1977 International NGO Conference in Geneva — and stated it plainly: decisions are taken on behalf of the seventh generation coming. That is a Haudenosaunee leader stating Haudenosaunee law in his own voice, and it is the correct citation for the principle as it is actually used.

What followed is the part to be careful about. From 1988 a Vermont company called Seventh Generation printed a version of the principle on household cleaning products; the phrase entered sustainability literature, corporate reports and strategy decks, usually attributed to "the Great Law of the Iroquois" with no citation that resolves to a primary text. The related and separate claim — that the Great Law influenced the United States Constitution — has a congressional acknowledgment (H. Con. Res. 331, 1988) and a live academic dispute, with Grinde and Johansen arguing for substantial influence and Tooker and Levy arguing against.

So the house rule, and it is a courtesy that costs nothing: quote the clause from Parker and name the version; attribute the seven-generation formulation to living Haudenosaunee teaching and to Oren Lyons; and say, once, that the Confederacy is a government and not a metaphor. Done that way the principle gets stronger, not weaker, because a reader who checks the citation finds something real at the end of it.

Now four places where long-horizon design is already financed and running.

Ise Jingu, Japan. The inner and outer shrines are rebuilt entirely every twenty years in the rite of shikinen sengu; the sixty-second rebuilding was completed in 2013 and the sixty-third is scheduled for 2033. Tradition dates the first to 690 CE, which makes the institution about 1,336 years old while no timber in it is more than twenty. And in 1923 the shrine began a two-hundred -year forestry plan to grow the hinoki cypress needed for rebuildings from about 2130 onward. That plan is now 103 years old with 97 years still to run. It is the oldest continuously funded long-horizon capital programme in the world and it is a forest.

The National Trust, England, Wales and Northern Ireland. Since 1946 the Trust has applied the Chorley Formula: a property is accepted only if it arrives with an endowment large enough to maintain it in perpetuity from its income. That is a single sentence of policy, and it is the reason a charity can hold hundreds of historic buildings and 780 miles of coast without a maintenance crisis in its constitution. The formula does not ask anyone to care in eighty years. It asks for a number now.

The American cemetery industry. Unglamorous and instructive: US state statutes generally require a share of every lot sale to be paid into an irrevocable perpetual care trust from which only income may be spent. An industry with no repeat customers, no brand loyalty and no growth story solved perpetual maintenance finance more than a century ago, by statute, because it had to.

The Netherlands. The Delta Act of 2012 created a Delta Programme, a Delta Commissioner and a ring-fenced Delta Fund with a statutory annual appropriation on the order of a billion euros. The country did not resolve to care about the sea. It put the caring in an Act, gave it an officer and gave the officer a fund.

And one correction, offered in the same spirit as the first. The much-loved story of New College, Oxford — oaks planted five centuries ago expressly to replace the hall's beams — is told in almost every book on long-term thinking. The college's own archivists have found no evidence for the intention. The beams were replaced in the nineteenth century from college woodland, which is admirable estate management and is not prophecy. The real cases above are better than the story, and they have documents.

THE ARITHMETIC

What works, what does not, and where the line sits

Chapter III.05 established what a discount rate is made of — the Ramsey terms, the declining public schedules, and the rule that a paper reporting one rate has reported one cell of its own answer. This movement takes that instrument and points it at a physical asset, which is where it does its most expensive damage.

First, what seven generations costs, as a horizon.

Seven generations has no fixed arithmetic in Haudenosaunee reckoning; the modern glosses run from twenty to twenty-five years a generation, so 140 to 175 years. Take the longer one and apply the rates that exist in the world.

  GBP 1,000,000 arriving in year 175
     at a flat 7.0%   (a common corporate hurdle)      GBP       7
     at a flat 3.5%   (Green Book, years 0-30)         GBP   2,429
     on the Green Book DECLINING schedule              GBP  10,184
     at a flat 1.4%   (Stern's rate)                   GBP  87,772

The declining schedule is worth 4.19 times the flat one at that horizon — a factor of four, available free, from a table the Treasury publishes. And one figure worth carrying out of this chapter above all others:

  the rate at which year 175 keeps half its weight
     ln 2 / 175  =  0.6931 / 175  =  0.396% per year

Above about four tenths of one percent a year, the seventh generation is already worth less than half of one of us. That is not a moral observation. It is what exponential weighting does, and it is why an argument about the long term conducted in net present value has usually been lost before anyone speaks.

Second, the real engineering, at the two lengths.

Design working life is a defined quantity, not a hope. Eurocode EN 1990, Table 2.1: ten years for temporary structures, fifteen to thirty for agricultural, 50 years for buildings and other common structures, 100 years for monumental buildings, bridges and civil works. US bridge practice designs to 75 years under AASHTO LRFD; UK practice to 120; the Hong Kong–Zhuhai–Macao Bridge states 120; Canada's Confederation Bridge states 100.

Over a two-hundred-year study period, that choice sets how many times you build the thing:

  design life  25 yr  ->  8 builds     design life 100 yr  ->  2 builds
  design life  40 yr  ->  5 builds     design life 120 yr  ->  2 builds
  design life  50 yr  ->  4 builds     design life 200 yr  ->  1 build

Now cost two of them properly. Case A is a forty-year structure: £40.0m of capital, routine maintenance at 0.60 percent of capital a year (£0.240m), a mid-life refurbishment at 20 percent of capital (£8.0m) at year twenty of each cycle, and a full rebuild at years 40, 80, 120 and 160. Case B is the same service designed for two hundred years: £52.0m of capital — a 30 percent durability premium — maintenance at 0.40 percent (£0.208m), and a major refurbishment of 15 percent of capital (£7.80m) at years 50, 100 and 150. The maintenance ratios and the premium are declared assumptions in the ranges whole-life costing practice reports; the sensitivity below is the answer, not any one cell of it.

  whole-life cost over 200 years, GBP m
  rate            Case A (40 yr)   Case B (200 yr)     A - B    cheaper
  0.0%  (cash)            288.00           117.00     171.00    the durable one
  1.4%                    117.36            72.74      44.62    the durable one
  2.0%                     93.14            66.58      26.57    the durable one
  3.5%                     65.69            59.63       6.06    the durable one
  4.0%                     61.11            58.47       2.64    the durable one
  5.0%                     54.93            56.90      -1.97    rebuild it
  7.0%                     48.51            55.25      -6.74    rebuild it
  10.0%                    44.52            54.15      -9.63    rebuild it
  Green Book schedule      68.97            60.48       8.48    the durable one

In cash the durable structure saves £171.00m — it costs 117 against 288, a factor of 2.46. At a 7 percent hurdle it loses by £6.74m. The reversal is worth £177.74m and nothing physical has changed between the two lines.

The indifference rate — computed by bisection, not estimated — is 4.510 percent a year. Above it, building the cheap thing five times is the correct answer in present value. Below it, the durable one is. Nothing about concrete changes at four and a half percent.

Third: why it reverses, which is not what almost anyone assumes.

The usual explanation is that discounting shrinks the distant benefits of lasting. That is true and it is the smaller half. Look at what the rate does to the four replacements Case A has to buy:

  PV of Case A's four rebuilds, 4 x GBP 40.0 m
     at 0.0%      GBP 160.000 m     100.00% of face
     at 3.5%      GBP  13.462 m       8.41% of face
     at 7.0%      GBP   2.862 m       1.79% of face

A discount rate does not only shrink the benefit of lasting. It shrinks the cost of not lasting, and by more — because a replacement is always later than the thing it replaces. At 7 percent, buying the same bridge four more times costs £2.86m in today's money: less than the paint on the durable one. That is the whole mechanism, and once it is visible the argument stops being about values and starts being about which rate is in the template.

And here is the Balenciaga cut, which reconciles everything in this chapter: the discount rate does not annihilate the case for durability. It annihilates the case for permanence, and leaves the case for renewability standing. A structure that must survive untouched for two centuries is betting the whole premium on a single guess about the future. A structure designed to be rebuilt, re-detailed and re-decided every twenty years — from a supply somebody is already growing — is buying the same two centuries and keeping the right to change its mind. That is why a 1,336-year-old shrine is rebuilt every twenty years and a 99-year-old concrete dam had to be blown up. Design for the seventh generation is not an instruction to build something that lasts. It is an instruction to leave the seventh generation the means and the money to build it again.

Fourth: the honest negative, named and priced.

Long-horizon commitment forecloses adaptation, and it is not a theoretical worry. A short-lived design carries a free option: at every rebuild you may build something else. The durable one does not. So the decision rule is not a comparison of costs. It is:

  PV(rebuilds and maintenance avoided)  >  durability premium
                                            +  value of the option given up

Price the option with declared assumptions: a 40 percent chance that a materially better answer exists by year fifty; a service-value gain of 35 percent of capital if it does; a switching cost of 25 percent. Net gain if exercised, £4.00m; Green Book discount factor at year fifty, 0.19726; option value £0.316m. Against Case B's Green Book advantage of £8.48m, the durable design still nets £8.17m and survives comfortably.

So ask the question the other way. How large must the foreclosed option be to overturn the durable case?

  net gain needed  =  8.48 / (0.40 x 0.19726)  =  GBP 107.5 m
                   =  2.69x the structure's own capital cost

Two and two-thirds times what the thing cost to build. That sounds impossible until you price a real one.

The Elwha. Elwha Dam was completed in 1913 on the Elwha River in Washington State; Glines Canyon Dam followed in 1927. Both were concrete gravity structures — the most permanent form of civil engineering there is. Neither had a fish ladder, although a Washington State law of 1890 required fishways, and neither could be retrofitted economically. Combined capacity was about 28 MW. The river's salmon runs, estimated near 400,000 adult fish a year before the dams, fell below 4,000 — a factor of a hundred.

Elwha Dam was removed in 2012, having stood 99 years. Glines Canyon's removal completed in 2014, after 87. The National Park Service puts the whole Elwha River Restoration Project at about USD 325 million.

  removal cost per MW of capacity        USD 11.61 m/MW
  new hydro capital, typical             USD 2-4 m/MW
  ratio at USD 3 m/MW                    3.87x

It cost roughly four times as much per megawatt to take the dams out as it costs to build comparable capacity. Against an illustrative lifetime gross output — 28 MW at a 45 percent capacity factor is 110.4 GWh a year, about 10,927 GWh over 99 years, some USD 546m at USD 50/MWh — the removal bill alone is 59.5 percent of everything the dams ever earned, before anyone prices the century of missing salmon. Capacity, dates and project cost are sourced; the output and price are a declared illustration.

That is the £107.5m figure, realised, in cash, ninety-nine years late. A permanent structure is an option written against the future and exercised by someone who does not get a vote. Price it in the paper, or someone will price it with a demolition contract.

DREAM

What becomes ordinary

In the organisation that has absorbed this, the design life of every asset is on the asset register, in years, beside the depreciation schedule, and the two numbers are allowed to disagree in public.

Nobody finds that strange. A roof that will physically last sixty years and is written off over twenty is simply a line where the accounting and the concrete have different opinions, and the register shows both, so the difference can be argued about by people who know something. Capital papers carry the design life on the front page beside the discount rate and the horizon, because III.05 established that the horizon does the damage the rate gets blamed for, and the template now has a cell for it.

Every long-lived asset arrives at the committee with its maintenance already funded. Not promised — funded, as a corpus, sized at the annual cost divided by a published real spending rate that the board sets once a year, the way it sets an insurance retention. When someone proposes a two-hundred-year structure, the proposal contains a two-hundred-year maintenance endowment, and the question in the room is about the spending rate, which takes four minutes and is minuted. The long-horizon asset stops being an act of faith and becomes a slightly larger cheque.

Procurement writes maintenance covenants that are indexed, because an unindexed covenant is a covenant with an expiry date nobody wrote down, and everyone here has seen the table showing that at 2.5 percent inflation a flat covenant buys 29 percent of its original work by year fifty and 8.5 percent by year one hundred. The indexation clause is one line. It is never omitted twice.

And the renewability question is asked out loud at the start of every design. What will the people who replace this need from us — the drawings, the spares, the species, the skills, the money? Sometimes the answer is a warehouse. Sometimes it is an apprenticeship. At Ise it was a forest planted in 1923 for a rebuilding in 2130, and the organisation that has absorbed this does not regard that as exotic. It regards it as procurement with the lead time stated correctly.

DESIGN

The structure that gets there

Five moves, in order, none of which needs anyone's permission to begin.

One: put design life on the asset register, in years, with its source. Eurocode category, manufacturer's stated life, or an engineer's judgement with a name attached — any of the three, as long as it is written and sourced. Most organisations cannot currently answer how long is this meant to last for any asset they own. The register converts a folk assumption into a declared one, and only declared assumptions can be discussed.

Two: adopt a declining discount schedule for anything beyond thirty years, and cite it rather than construct it. The Green Book table is published, free, and defensible in front of any auditor precisely because a finance ministry stands behind it. At year 175 it is worth 4.19 times the flat rate. This is the single highest-return paperwork exercise in the volume: the design principle from Volume I is never construct an authority where you can cite one.

Three: fund the maintenance as a corpus, not a promise. For any asset whose design life exceeds the tenure of the budget that maintains it, size an endowment at annual real cost divided by the board's published real spending rate, and raise it with the capital. For Case B: £0.208m a year at a 3.0 percent spending rate is £6.933m of corpus, 13.3 percent of the structure's own capital cost, for a total year-zero commitment of £58.933m against £288.00m of cash over the same two centuries under the rebuild case. The Chorley Formula is this move, written in 1946, and it has held for eighty years.

Four: index every maintenance covenant, or name its expiry year in the document. Those are the only two honest options. A flat covenant of £0.208m buys 55.2 percent of its work by year thirty at 2 percent inflation, 37.2 percent by year fifty, and 13.8 percent by year one hundred. At 3 percent inflation the year-one-hundred figure is 5.2 percent. The clause costs a sentence.

Five: design for renewal, and write down what renewal needs. Every long-lived asset carries a short document — call it the succession note — naming the four things the next builder will need: the drawings and specifications in a format that will still open; the materials and where they will come from; the skills and who will still have them; and the money, with its instrument named. Ise's succession note is a forest and a twenty-year rite. Yours can be a drawing archive, a spares contract, an apprenticeship and a sinking fund.

Governance. Design life, discount schedule, spending rate and indexation basis are four numbers and they belong on one page of asset policy, reviewed annually, signed. They must not live in a spreadsheet template, because a number that lives in a template is owned by whoever last edited it.

Sequence. The register first, because it costs nothing and creates the vocabulary. The schedule second, because it is a citation. The corpus third, because it needs a board-set spending rate and boards set parameters they have seen used. Indexation and the succession note last, because by then somebody is asking for them.

DESTINY

How it holds when nobody is pushing

A long-horizon commitment survives for three reasons and fails for two, and both lists are short enough to remember.

It holds when the money is separated from the intention. An endowment, a statutory trust, a ring-fenced fund: the Delta Fund persists because it is in an Act, not because the Netherlands renews its resolve each year. The cemetery trust persists because the statute makes the principal untouchable. Every durable practice in the Discovery movement is a practice whose funding somebody made hard to stop.

It holds when the renewal interval is shorter than institutional memory. Ise rebuilds every twenty years, which means every carpenter who works on it has worked with someone who did it last time and will work with someone who does it next. A skill exercised once a century is a skill that has to be reinvented each time, at full cost. Choose the interval so that the knowledge is transmitted by people and not by documents, wherever you have the choice.

It holds when someone's current compensation moves with a metric about the future. Handback condition surveys in concession contracts do this: the concessionaire's final payment depends on the residual life of the asset at transfer, which makes year-twenty-five maintenance a year-twenty-five cash-flow question. That is the mechanism to copy.

And here is how it fails, honestly. It fails when the endowment's spending rate is set by whoever needs the money. A corpus is only perpetual at a spending rate below its real return; move the rate from 3.0 to 4.0 percent and the same £6.933m corpus funds £0.277m a year, which feels like a gift and is a slow liquidation. The defence is that the spending rate is a board parameter with a date on it, reviewed annually against realised real return, and never set in the same paper that spends it.

And it fails, more expensively, when durability is used to avoid a decision. The Elwha dams were not a mistake of engineering; they were excellent engineering aimed at a question that stopped being the right question within one lifetime. Any asset whose design life exceeds the confidence interval on its own purpose should be designed for removal — with the removal costed, provisioned and in the same paper. Write the demolition into the birth certificate. It is the cheapest insurance in this chapter and almost nobody buys it.

DELIGHT

What it feels like

There is a specific pleasure in standing in front of something that was built for you by a person who knew they would never meet you. It is not gratitude exactly. It is closer to being addressed.

And there is the quieter pleasure on the other side of it: writing a specification that is more generous than anyone asked for, at a cost nobody will notice, for a reason you will never be thanked for. The extra cover on the reinforcement. The joint that can be opened. The drawing lodged in a format that will still open. It is a small, private, entirely unsupervised act of hospitality, and the work of a life contains very few things as satisfying.

The nursery rows are the best of it. A tree planted for a rebuilding in 2130 is not a solemn object. It is a completely ordinary young tree in a completely ordinary bed, being weeded this morning by someone who will be paid on Friday, under a plan written in 1923 by people who wanted the carpenters of the twenty-second century to have good timber and not have to ask. That is what this economics feels like from the inside: not sacrifice, and not prophecy — provisioning.

OPERATIONALIZE THIS

At the level of finance

The instrument: a maintenance endowment with an indexed covenant and a handback condition.

Not a green bond, which prices off the issuer's credit and buys a label. This is narrower and harder: a capital sum raised alongside the asset, held in trust, spendable only at a published real rate, contractually tied to an indexed maintenance obligation with a measured residual-life test at transfer. It is the Chorley Formula, the cemetery trust and the PPP handback reserve in one document, and every component of it has been in commercial use for decades.

The mechanics.

Size the corpus. Annual real maintenance cost divided by the board's published real spending rate. Case B: £0.208m / 0.030 = £6.933m, which is 13.3 percent of the asset's capital cost. Raise it with the capital, in the same approval, as one line.
Publish the spending rate once, as a policy parameter. Norway's fiscal rule is the precedent to cite: transfers capped at the expected real return, cut from 4 to 3 percent in 2017. One number, set by the principal, not by the spender.
The covenant. An indexed annual maintenance obligation on the operator, with the index named in the document. Unindexed, it buys 29.1 percent of its work by year fifty at 2.5 percent inflation. This is one sentence and it is the most valuable sentence in the agreement.
The trigger. A condition survey on a fixed cycle by a named independent engineer, with a defined residual-life measure. Florida's post-Surfside regime is the working precedent and it is unusually explicit: milestone inspections at thirty years — twenty-five within three miles of the coast — and structural integrity reserve studies with mandatory funding from 31 December 2024, with the previous right to waive reserves removed. Champlain Towers South fell on 24 June 2021 with 98 deaths; a 2018 engineering report had identified major structural damage and the 2021 assessment to fund the work was about USD 15 million. The reserve study is now the law because the alternative was priced.
The sinking fund, where the liability has a date rather than a horizon. To accumulate one £40.0m rebuild by year forty costs £0.662m a year at a 2 percent real return — 1.66 percent of capital cost per year — of which the fund itself earns £13.51m. At zero real return the same target costs £1.000m a year. The gap between those two lines is the entire argument for starting the fund early rather than large.
Term and security. The trust deed runs with the asset, not with the operator. Security is the corpus itself, which is why this is financeable and a promise is not.

The balance-sheet treatment. Capitalise the durability premium into the asset and depreciate over the designed life, not the tax life — an asset whose maintained condition is stable should not be depreciating on a schedule that assumes it is falling. The endowment is a restricted fund and is disclosed as such; the indexed covenant is an onerous-contract test under IAS 37 if the indexation outruns the revenue, which is precisely the test you want run annually. Talk to the auditors early. This is a conversation about useful economic life, which they have every year anyway.

The counterparty. Internal first — treasury holds the corpus for the operating unit, documented in a week, giving you a track record. Then a trustee: a charitable trust, a community foundation, or the same escrow agent your organisation already uses for decommissioning. The land trust sector runs thousands of stewardship endowments on exactly this pattern and its standards are published.

The number that decides it. One line, on the front page:

   capital  +  (annual maintenance / real spending rate)
   ---------------------------------------------------------   <  1
      undiscounted whole-life cost of the replacement cycle

For the worked case: (52.000 + 6.933) / 288.00 = 0.205 — the endowed durable asset costs one fifth of the rebuild cycle in cash, and 4.89 times less in total. Present it in cash and in corpus, never only in present value, because present value is the frame in which this argument has already been lost, and the funder is not being asked to believe in two hundred years. They are being asked for one sum today, against a schedule of sums that are already in somebody's budget line, four times over.

The first ninety days.

Day	Action	Artifact
1–15	Put design life, in years with its source, on the asset register	The register, one new column
16–30	Adopt the Green Book declining schedule beyond year thirty	Treasury policy amendment
31–45	Board publishes the real spending rate for maintenance corpora	Board minute, one number
46–60	Size the corpus for one long-lived asset; draft the trust deed	Corpus memo and deed
61–75	Add the indexation clause and the condition-survey trigger	The indexed covenant
76–90	Write the succession note: drawings, materials, skills, money	The succession note

APPRECIATIVE QUESTIONS

Twelve, for a room

Discovery — what is already working

What do we own that has already outlived the people who specified it — and what did they do that made that possible?
Where have we already paid, willingly, for something to last longer than our own tenure? What made that decision easy at the time?
Which of our assets could be handed to a stranger tomorrow with everything they would need to look after it? What is in that handover that the others are missing?

Dream — what becomes possible

If every capital paper carried the asset's design life on the front page beside the rate, what would we approve next year that we would not approve this year?
Imagine our maintenance for the next century is already funded and nobody has to ask for it again. What does the maintenance team do with the attention that frees?
If we planted something this year for people who will use it in 2130, what would it be — and who here would most enjoy looking after it?

Design — what we build

What is the smallest asset we could endow properly this quarter, corpus and covenant together?
Whose signature converts our spending rate from an assumption into a published parameter, and what would they need to see first?
What would the succession note say for our most important asset — drawings, materials, skills, money — and which of the four is thinnest?

Destiny — how it holds

What would have to be true for this endowment still to be intact when everyone in this room has moved on, and who would be tempted first?
Which of the things we are building now might stop being the right answer within fifty years — and what would it cost to take it out?
Who are the people who will replace this, what will they need from us, and when is the last moment we could still give it to them?

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Note on figures. Every figure in this chapter and its apparatus is computed in lib/verify/IV_09.py and printed there with its inputs, units and source. The Green Book schedule, the Eurocode categories, the Elwha dates, capacity and project cost, and the Florida and Delta Act provisions are quoted from the documents named above; the whole-life costs, discount factors, indifference rate, endowment corpora, sinking-fund payments, option values and indexation decay are computed. The Case A and Case B maintenance ratios and durability premium are declared assumptions, and the sensitivity table is the result. The discount rate itself is the subject of Chapter III.05 and is not re-derived here.